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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d2faa1517bc35b95556e14a7d3c56848ed76600dff49909a50c7ab6f86c3fdc' 
  AND token = 'PueVx8P50tUuaC0Ehp7+7A+Qb7G8l3ubos+DtdoPxNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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