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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bfa398adb921847f8687b5134a14760dc7931a2c2387ce327f9e140598a7d6b' 
  AND token = 'g3P/uqbX9Hk8v0jJ9aH9UW76f8/p5PiWoP3DDcEYZBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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