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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e809e96b6e8c92169a2f23f95f9e0093001037dcbc8aefb784cde2d62ab0323' 
  AND token = 'EBa2dyyL7E1LXYoG36+h4dgmRBN0R3Fr591/F1bxP30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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