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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a6e217c901d20a789683cd950bc6dfe13a7a01c38ff0d18abca2fef3491884' 
  AND token = 'rbWG7p3hu+uziX5SvIbypxfapPy3xD/7yb01USrRrwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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