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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d349cc03c290e37a9b445137ac72996d41dcca31f8e32d28de66544109a006' 
  AND token = 'WwSROXeEbh8XTL78OL2hpx8zr3knCDLW4YKvGoQ6TN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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