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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b9f59c2e13051e46dbe9b49f559b5725a4f4ee0551b54fd56329aeba585557d' 
  AND token = 'H1n0PRDUD2KBPfE2Epmx1DLJNN5CVyg7HbQMZCpla4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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