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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0328a057d0a0b27a7a221d39a0fd3fc5bfe77e6535c505f78c709568e97709a7' 
  AND token = 'ZCG39iyBX69oSS8gahbH1cr93okY+1Dbn1UkDS8S9N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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