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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69746413ee9b4786a35a903acff962c04f7ccb2cd566ede877c7d6b67d327829' 
  AND token = 'TN9+dxkIUVhn4dH2IuuzqQQm0e9MxFjCn+CFpGHm7fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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