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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d735a60271caa01237d96f1ba270a9ec6746917be2ecc6c2be40409574a09f6' 
  AND token = '+g0rQCqkoq7WTWgcSFTkeTEd/VIWCg0BgKT9R+xenWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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