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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94c315e9f9027a63746e43f513d4f310f44fc546f20b6dc2f7d114f81b34ea9' 
  AND token = 'QxZwlbW089fTRNdJSyy1c1tqPB5s7MgH15C4+E3awio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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