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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9499602fb5824731f8f4084b50b68fe7ab358b3e989c618cd0d6aace0289732e' 
  AND token = 'kcDsWdZU+1jc+ZVis1WiY8h3+6fvDRC1gWc+5fmeyG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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