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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15368974729feb38061f4aea61e1fe0dea2b92da7f8ee8234cba3786d88688cb' 
  AND token = 'K9b70SfW6B58vT8mCEeqQl+1emENfKfUhgLa2urz7Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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