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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d9481e40e8e40674d2af86b91e46faf0d1ac56429e9950f9dab3ede6ad2691b' 
  AND token = 'XSPM4k2xuUCneFGrypKe4BRiBQd72Qm8PT7mHNvy/sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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