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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe676a31b4f4f445ff402f5416b77bda0aaced7e27eac77d3af45e705af5ff0' 
  AND token = 'C84pIvoU3iYw/tvNxY8nxXvG6x4WrmtQtmrTHvSyn/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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