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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96eaef893b9d3d9c2b90070c01c63472635d7c4d444ac0b1a25a490e5ecfa7c' 
  AND token = 't3sFRswfFdfq36tiU4byq4fVgL1gSdLH9EkRoZUUTMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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