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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee23dd5515ed8ee903c7f05856af991940d4af342cea193ee0bfee089a76268' 
  AND token = 'mJ3O9qIppa/thfquSGUzU1K56PntZf3DW7fGxm1885I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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