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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fefd03e1c6d3cf7d26c2bb8ad126a7c89900909ff91be0d94ca233dd9e7a8ac' 
  AND token = 'quxhcxq8Ps7J4HDopVZwFlyub2V7nEYmOwcCC0U4Qy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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