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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f19f15c3a9fa9e482b2c234c25ba4ee59420b464c136a9084ab1cbaa2c8af87' 
  AND token = 'saf85ZwkOVmSQPu+ozlGcxl6b63dljzrkmDRXDEKJPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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