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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a39fa2c1f9bad810d2cca98214665b24b0498de535ba0d38fc600b0a9f70053b' 
  AND token = 'iLs95MNBMXb5aT8yl8/q+9Uf/AicDQB70igVfyMGZNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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