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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f140a99072a76044729d8911c386d2ec765fc8ad5bc877efab082aef42800688' 
  AND token = '+EoRlGi1i5nrYpduB9nMiyWAWU93EllVdPzzDGLolCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}