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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba128b48fd3e5a02298c61a00ecc25c9e0ba71f937e7bf419d851b1b9a61ab21' 
  AND token = '2teSQbX6CNAe3z+kxHXeeuJql9QZz9++uKqCosHZkd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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