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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bafa3554cc7da9af630c5611f533dea994e790822a864510b5e2a379c26b1f20' 
  AND token = 'aThFcXdZpIq+3uwO31NcBKr/qE2II25s82C0F0Z0YKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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