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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f61c70df7619a441398be803a0df07e4551bfb1db7040a2ad13e8cc478a5afef' 
  AND token = '4tRubeg+LzQNHqQPWi9+tGBeekxbaKocFF9LT1uIwIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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