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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7384369192bae2a552808723419b0ec8aaa3054b52b08b7bf364cc40f8b15047' 
  AND token = 'gOXIEJsXzMZB604gusWlIBmIhkEzx/EiolntBRbxbZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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