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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f73e92bffe5ed98a0dca24dbb0769b8d8ecc4d2b7a955589e693566877f008b' 
  AND token = 'ic6S9jX6+6xBFAj+7/03QEpDvptQycf93W4Uk+2YTzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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