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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77eb7ab1eab6aab3b4c893d1d80da7cbc8a1c798687b02444932ab7e1921bbbd' 
  AND token = 'lKWIHShhMYd/o7gSccu7Ohcv7I8O15n/ebpdCpTjxwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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