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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba1cea83cf02752a58df99fef0c26dc1c0817ffd39ad4d338909ff14666688d' 
  AND token = 'VcUTHhH0lo7ZxzqUhrMxLAf77pdgGE7GhVt48vh7IUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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