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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1d650f10c80348541a1b88adf4c980c5d0e028e72dcc66ec0101ef4a5b4b63' 
  AND token = 'hShaFbd1L1IPo8UJ6tfw9r4MZlbjIF4ROomBq1q5/iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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