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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c4edfee1f9f1880da993aa271b02c1096399812488e5e4e108f75781110b1d' 
  AND token = 'nOtP4YDpY/rS0I9yNK9nNAaRNqIO//PA/RgFM2F4gnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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