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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81b55f5fe0439285705483614a0520ac8d6482d7ddff17142702402689e62f20' 
  AND token = 'yOLLgYg+rSqKWH575mozwhnHxGZls2MuRoIf2a0qPPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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