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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f279eb7f9b0ddda78573e084cd96aace23df66fcb815b4a858e1af42f06d6cd' 
  AND token = 's14SwyHfjJ0gQSdqvoZ4kpftROofykrJSnYnyb7+SIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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