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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f92b731e57fa98631ab22b816557819050149895df9c7637481842e8c95369e' 
  AND token = 'Hw+qTBeuaf6m1ebvbrVReWmxXfJRLdN8YT/AVzRTHiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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