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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32b1c0152ec9404d6646a486f611e843e4f322e7690282ace3d2380eca1eb1e' 
  AND token = 'RuKHG92yv5rkL5+bH7D+C53qG0TFYLZ4JWKWaX3y5Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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