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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27fae530f5d6a0f0cf218a0e8a20caf1a5c7b2792763f715811388a3dc84fb08' 
  AND token = 'GVCuoR1TxNha6Uaw180AtthO/eQo7XMk/hqCJJvfQC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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