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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3e167a0f6806bdc8d8bf6fccf02f923c1c064bb9c5fd49cd817ee8ac5ca042' 
  AND token = '8+YXG7GLMA7+wqsAmsAa9wXX3FsFUzxEgdVEn8RXWEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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