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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9619190aecc540edc9e5edbd0d2b5f3f250e5f580e10edc59faa1c47a883425c' 
  AND token = '4cs9yOtJvJfCnTNS0z3gcMnCddbnfPbCOkIgse3n+Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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