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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99941337ad40a880a1363d8e8b9a46cf904bb978df59add56e3a5d7dc73225d6' 
  AND token = '00GGJjbCKe9F4UsLejEGdtJwGMvy0FZI5iLhgCrZAXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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