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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edfa86d6b248de64f87eb165d6899c57aba1cc4678cc47d7bb224a5f3996a3b8' 
  AND token = '86WCbwXUHkEf24z1eofaF/vFaL9TM6Y/vSoZspsM1S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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