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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ac1b4793006dbcf44a488bd97885bb4bd471dd27ce7bf3c19cbb02b5059b06' 
  AND token = 'U4v5Y18xgBdrOWI/336DWLpPZs9ZvANK9l6X5nd4AKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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