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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86cf3bfb38866412dc8dd3d5521ea38a3beb274f4d7c7175c17243deb07b1a16' 
  AND token = 'TP56ScubszNHfP2mhpWGiYkU/21P36i+WUabtUUPIQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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