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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f68678c7358959733de1890dfbd754d64050abff0cde3155044a8ae6acdf10' 
  AND token = 'xRfTht/H0GB22HLNeaOJM9Z+5iyxFcuXFKrww/9P/ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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