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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa70edfa497be489decdaa08d921157ebc1b592fc9f6693fb8e2a2c56c33cfec' 
  AND token = 'l8BiQfVod2tn9WD3LWeLB2b8AJuvYtsQpIFrTUEvaKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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