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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f13565f771604a1541bdb6de0eb57678da7cc94ad610273fd4fd5f81194973' 
  AND token = 'b4j5VoCzDRqgJppWtA+bjl75WRJerHhwfFaeQFx669E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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