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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7938721471100c5a6d130d2d947042d9d65a863a61c154f34b2fce1eaae0c2' 
  AND token = 'gcRXH+lNjhsosISHndcgKxiLYwmLniheUpIn64X9dW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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