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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05400738be22e726968615b320fe86d568a22120c3bd3c272915d114f88f3ce8' 
  AND token = 'H4eVsuKyepcgPo+6v5dPen5WUhRue2gBRMD+hm0muUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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