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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c259fc94b5171acb66b065583594bfcee3268cf883234922841402f6b4617b83' 
  AND token = 'Wej0dwqSpmvW6Z1cMj45FLw2kwUqHIbmN104TKIRnnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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