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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13000e4297325ab75af26e4be86ef09a86483d4bde5bb5b7da55c4b97528f8f' 
  AND token = 'yMagr3d4izXMN1kGf9CWteltBEstln4onlsyBj9fwck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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