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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37fa06091a68605c2864fb54d4e4c7767477dcf8cf0f105d04d65377a36fe30' 
  AND token = 'hxJP5KzhAn5ml/GwXLN66+pKyz/Gk9jj0B5tFE7cwh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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