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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0ea2de6ecf2683480ec11d26ae1fc2713810550d024ccdd29886d9e8ac14456' 
  AND token = 'pH529gZ8c435zCu4nZEDmDljvZKu+pR/40pliuAZdUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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