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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66401f628ba7c6a10b9472b461e5e4f49885ab5945db57bd99e743ee922987a6' 
  AND token = 'nKsJJV2peti4ISAy7qVPswWjkoQRd+QCoxoubY//u6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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