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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '459a120c59de910053ff606a4d208a7b67a9d5f5ce1c0e646f3666096ec402c5' 
  AND token = 'zK6IqX0ssQEPecf1knU4K5I0piN6qyFiOAeKya7IMzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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