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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f6de8923a2cfdd1d362a7e4a179c95dfda6bc2958ad1060cb354a4cd2bef2f' 
  AND token = 'hWyjcKYkEBSQrJku4MPjp/IRdeCUcL+y3AleRkIc0Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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