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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5988b6787dbf964cbdf0ef2e56441b487aa25b2dc2cebad886ec79b1d8b5329a' 
  AND token = '+9QY48t4PYCPOYk4vGClwrfB/sZH14eCx+n2SS5+5CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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