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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb92e59992700be07afe57b0aa4ee62048a76910da879491e3d87f8c2d3b5e61' 
  AND token = 'OVeyhlhnQjxVQY4elquKLampWAzKj6rNRzFJCchy7nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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