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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1aced678c7304d35dd0f74d15b17087e3e46d108ee90fb6e2980093d7de25d3' 
  AND token = 'zKyCM6R+r3zJayNJnEq9mdXWO/9HMKRwX11zDMuZsJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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