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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a09211de7b1d3d8eb3d3e2729cb9ca6e57bf1458963831d7b9fc373033b19f6' 
  AND token = '6Bi0OJunxru9vGVnDgJjEdDiwc37Qt2kkFaQOwY6dUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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