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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d1964a4a4ad912af3449c2879c761934587464134dae75bb1523bbceaf9335' 
  AND token = 'H1/qudLR/ny2du7It2VSoTpFjTRWCL5RbBABo3enu7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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