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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84bee746e50a52f6e0dee5fb47e2fc8c981fc9928e52672e9553bc4a3334ca9' 
  AND token = '8RhAZIfn3KLzcSvnXoCyS0v8owJXzMFCWzzSVWi7M8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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