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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f068786d2a826f840adbce4e1d20797dec342d0dbbb7bb767522861b5865ffd4' 
  AND token = 'BtbWShhvhruDJ9RRAec9GFWr21rNK56e+/fp1j+fYig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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