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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae0535947bd5d06e60adbefe5e88897917cc50b66f6322d1b86f25ac4fe207a' 
  AND token = 'q1wuGwSMx+pFa9nF7BD1oip8pCTmpRbelacxF+ThXmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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