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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14d7298f15f8bf8e6552886d342fd7252d8a982405566bc86eff3f8b5ef39a5' 
  AND token = 'deE6Os+aCt3mfb0FNo9vVAe7RtYshWsrL+sBY6l5R8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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