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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c7771e04da1baea537862467057f0afd1a62b668ece046d7f10b2e2ce9cbb9' 
  AND token = 'qVoVDHUa+Et6H1XNH1A32cccgIYx5J5JuD/33cu05Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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