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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd62147610742d795165e765b10d88e72e78a5bbff52b05aa0449c378e8c281e' 
  AND token = 'TsnL+nYhOpdyWBq37+kgcJ5KlIcdI3YP2cWJyfk5FXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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