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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b9c838b7d7815f8ad63f56d42e639f57c38e2a8596c39c5314197471466312' 
  AND token = 'EyOmPH7lfCL5l41c2I+ckmzDRGdswOc8cgveRyb/uPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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