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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '958cfaf979f4a2bba5246024c510a0235305ed46d4e67199df111c3d704f836f' 
  AND token = 'vNnl2Wwb9/4wC+N6XC6+1uq0uNT+EDs7kVvoATTb58U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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