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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f9485292672c3f8a70260574cfb3e7a7ef3226e449f72160ee8e1dd5290cca' 
  AND token = 'c8s6abh4SZouM79/K1HGrhjuG7Gdj4vK/4bMTCYZxKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00730

JSON explain

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